Git steps: what does method=copy do with submodules?

[vext01]

The docs say this about method=copy for the Git step:

This first checks out source into source directory, then copies the source directory to build directory, and then performs the build operation in the copied directory. This way, we make fresh builds with very little bandwidth to download source. The behavior of source checkout follows exactly the same as incremental. It performs all the incremental checkout behavior in source directory.

I think the docs need to say whether method=copy (or "incremental" for that matter) sync the submodules or not.